Palmer, Allison R.  1927- <br/><br/>
Glyptagnostus and associated Trilobites in the United States / 
by Allison R. Palmer. 
 -- Washington :   United States Government Printing Office,   1962 
 - 49 p., [6] h. de lam. -- 
 (Geological Survey Professional Paper  ;  374-F).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Estados Unidos<br/>Trilobites
<br/><br/><label>Universal Decimal Class. No.: </label>56(73)